Spicy
Hot, Difficult, Painful
い adjective
The kanji and the word are exactly the same. That means they share meanings as well. That being said, this can also mean difficult or painful, often in a psychological sense, though it can be physical as well. I guess if you're in a spicy situation it's going to be a difficult one.
Depending on the context, the reading for this word could be からい or つらい.
The からい reading is the spicy one that you learned with the kanji, which you can remember because spicy foods give a からて chop to your mouth.
The つらい reading is the difficult or painful one. You can remember this because two Ras (つら) are way more difficult to deal with than one Ra.
「やばい〜！めっちゃ辛い～！でも、このカレーすっげ〜美味しい！」
"Omg! My mouth is on fire, but this curry is sooo good!"
私、辛いものは食べれないんです。
I can't eat spicy food.
え、そんなことがあったの？それは辛いね。
Oh, that's what happened? That's tough.